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src/Yavsc/Helpers/OAuthHelpers.cs

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+using System;
+using System.Security.Cryptography;
+
+namespace Yavsc.Helpers {
+public class Helper
+    {
+        public static string GetHash(string input)
+        {
+            HashAlgorithm hashAlgorithm = new SHA256CryptoServiceProvider();
+       
+            byte[] byteValue = System.Text.Encoding.UTF8.GetBytes(input);
+
+            byte[] byteHash = hashAlgorithm.ComputeHash(byteValue);
+
+            return Convert.ToBase64String(byteHash);
+        }
+    }
+}